Questions from Statistics Principles

Q: In 1990, the mean height of women 20 years of age

In 1990, the mean height of women 20 years of age or older was 63.7 inches based on data obtained from the Centers for Disease Control and Prevention’s Advance Data Report, No. 347. Suppose that a ran...

Q: The ACT is a college entrance exam. ACT has determined that

The ACT is a college entrance exam. ACT has determined that a score of 22 on the mathematics portion of the ACT suggests that a student is ready for college-level mathematics. To achieve this goal, AC...

Q: Do students who learned English and another language simultaneously score worse on

Do students who learned English and another language simultaneously score worse on the SAT Critical Reading exam than the general population of test takers? The mean score among all test takers on the...

Q: A newspaper article reported, “The Cosmopolitan magazine survey of more

A newspaper article reported, “The Cosmopolitan magazine survey of more than 5000 Australian women aged 18–34 found about 42 percent considered themselves overweight or obese.” Source: Herald Sun, Sep...

Q: In a study published in the American Journal of Psychiatry (157

In a study published in the American Journal of Psychiatry (157:737–744, May 2000), researchers wanted to measure the effect of alcohol on the hippocampal region, the portion of the brain responsible...

Q: Para-nonylphenol is found in polyvinyl chloride (PVC) used

Para-nonylphenol is found in polyvinyl chloride (PVC) used in the food processing and packaging industries. Researchers wanted to determine the effect this substance had on the organ weight of fir...

Q: A Fair Isaac Corporation (FICO) score is used by credit

A Fair Isaac Corporation (FICO) score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a FICO score o...

Q: According to the American Time Use Survey, the typical American spends

According to the American Time Use Survey, the typical American spends 154.8 minutes (2.58 hours) per day watching television. A survey of 50 Internet users results in a mean time watching television...

Q: In 2002, the mean age of an inmate on death row

In 2002, the mean age of an inmate on death row was 40.7 years, according to data from the U.S. Department of Justice. A sociologist wondered whether the mean age of a death-row inmate has changed sin...

Q: In 2001, the mean household expenditure for energy was $1493

In 2001, the mean household expenditure for energy was $1493, according to data from the U.S. Energy Information Administration. An economist wanted to know whether this amount has changed signif...